Jon R. wrote in post #1106750:
> I wanted to try and use ruby rather than a library

Here's an example without using CSV:

File.write( 'source.tsv', File.readlines( 'source.csv' ).map do |l|
  l.chomp.gsub( /^"|"$/, '' ).gsub( /","/, "\t" )
end.join("\n") )

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